本文提出利用反演理论对GIS数据进行质量评价，对超定、适定、欠定等问题分别求取相应解，为GIS数据质量的研究提出了新的思路。
In this paper, I put forward inversion theory assessing GIS data quality, gave respondence solution for different problem. This is a new clue to research for GIS data quality.
针对目前欠定盲分离问题中源数未知，采取“两步法”进行分离源信号。
The two-step approach is often used to separate sources in underdetermined blind separation problem.
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